Four years after Anthony's death, his aunt Kate Whelan has made an emotional plea for people to take care using dating websites and apps. She said: "Four years ago I got that dreaded knock on the door.

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Port had arranged to meet Anthony through the website, Sleepyboys, and paid him £800 for an 'overnight stay'. He picked him up from Barking Station at 10pm and gave him a fatal dose of the date-rape drug GHB.

In the early hours of the next morning, Port called police reporting he had seen a young boy "collapsed" on the street outside his flat after claiming to have returned from a night shift.

(Image: GETTY IMAGES)

He did not give his name, and said he was just driving by. Emergency services attended the scene and found his body.

Police initially did not treat his death as suspicious and Port went on to murder Gabriel Kovari, 22, Daniel Whitworth, 21, from Gravesend, and Jack Taylor, 25.

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Despite these three men being discovered dead in similar circumstances during a 15 month period, it was over a year-and-a-half before officers linked the deaths and realised a serial killer was at large. Port was last year given a whole life sentence.

The family of Port's victims have jointly instructed specialist lawyers as the Independent Office for Police Conduct (IOPC) continues its probe into the handling of the case.